Signal-bell for telephone systems.



PATENTBD APR. 24, 1906.

0. E. EGAN. SIGNAL BELL FOR TELEPHONE SYSTEMS. APPLIOATION FILED FERN, 1903. RENEWED SEPT. 2]., 1905.

UNITED STATES PATENT OFFICE.

CHARLES E. EGAN, OF COLUMBUS, OHIO, ASSICIOH TO THE EGAN ELECTRIC AND TELEPHONE MAN U FACTU R I NC:

C(DIIANY, OF

PETERSBURG, ILLINOIS, A CORPORATION OF ILLINOIS.

SIGNAL-BELL FOR TE Specification of Letters Patent.

LEPHONE SYSTEMS.

Patented April 24, 1906.

To It mil/Ont it 711/01 concern.-

Be it known that I, CHARLES E. EGAN, a citizen of the United States, residing at Columb us, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Signal-Bells for Telephones, of which the following is a specilication.

My invention relates to call or signal bells for telephone systems and the like, and has for its object to provide a combined ringer and condenser for use on signal and telephone lines employing alternating and direct currents.

To this end the invention comprises a call or signal bell provided with a polarized ringer with a magnet-coil on one leg thereof and a cmidenser on the other, so related that the ringing-circuit passes through said coil to the condenser, the armature being first attracted by the core piece or leg of the coil and then upon the discharge of the condenser swinging over the other pole-piece and reestablishing the initial condition.

In systems of telephony wherein alternating currents are employed for signaling purposes and direct or battery currents are used upon the line it is necessary to employ a condenser of relatively large size and capacity in series with each ringer-magnet to close the ringer-circuit. By means of my invention I provide a condenser that is applied to its intended use without providing any other connections and housing than those required for the ordinary ringer-circuit and that afi'ords a unitary instrument performing the functions of the two corresponding separate instruments in a more efficient manner and with a less expenditure of energy.

The invention is illustrated in the accompanying drawings, in which Figure 1 is perspective view of the ringermagnet and condenser with their circuit attachnients. Fig. 2 is a plan view thereof. Figs. 13 and 4 are a side elevation and an end view, respectively, oi the apparatus; and Fig.

is a diagrammatic view showing the relation of the various parts including the circuits.

Referring to the drawings, 0 indicates an electromagnet-coil which is mounted upon one leg 0 of the usual type ofhorseshoecore, which latter comprises a similar parallel leg 0, joined to the leg 0 by a back bar or supporting member 0, which in turn is adapted to be attached within the bell-box by perlorated lugs 0. Midway between legs a and (2 there is a metallic bar 0 ad justably attached to the back bar c and carrying at its outer end a bracket 0 in which the armature 1' is pivoted, so that the latter may vibrate toward and from the respective poles. A hammerf, attached to the armature, cm'iperatcs with the usual double arrangement oi gongs or bells g 9. Attached to the back bar and embracing the ends and one side oi the core is the usual permanent or polarizing magnet b. Upon the leg or pole-piece v is mounted a condenser 9;, which is iormed as a roll or spiral embracing said pole-piece. Said condenser may be Formed ol a layer of metal foil coated with paper, shellac, or any other suitable dielectric of suflicient resistance to properly insulate the successive convolutions of metal foil from each other and from the polepiece 0. A conducting-wire 12 connects the outer terminal of the magnet-whaling with the metal coating 01 the condenser, and the line-terminals oi' the ringer-circuit m 0 are connected to coil (1 and the metallic frame of the ringer, respectively. The magnet-coil and the condenser are inclosed in a suitable protective covering to exclude dust and mois ture, so that when assembled the apparatus does not di'll'cr in size, form, or general appearance from the conventional bipolar ringer.

The operation ol the above-described apparatus is as follows: An alternating or magneto current sent over the line enters coil a of the electromagnet by way of lead m and passes thence through connector n to the condenser, charging the latter. Upon discharge of the condenser and reversal of the current in the circuit armature e is attracted by polepiece 0 by reason ol the current reversal and the fact that the armature is permanently polarized, while the pole-pieces are alternately polarized in opposite directions by the passage of the alternating current. The next impulse over the line moves armature a into contact with pole-piece c. This cycle of operations is repeated for each complete alternating impulse on the line, causing the armature to vibrate and actuate the hammer or clapper f. It is to be observed that the rents on the line.

I shall designate the armature of my ringer netic material,

as disconnected for any electrical function from the other parts. By this I mean that the armature does not close or open any circuit and has no function other than the conversion of magnetic energy into mechanical motion and. that again into sound through the gongs.

Having thus described my invention, What I claim is- 1. In a signaling apparatus for telephone instruments, a combined ringer and condenser comprising a frame, a yoke of'magnetic material, a pair .of elongated cores ex tending from the said yoke parallel to each other, an insulated Wire Winding or bobbin upon one core, in approximately cylindrical shape, insulated conducting-sheets rolled and compressed upon the other core to form a condenser also approximately cylindrical in shape and of substantially the same diameter as the said bobbin, a pivoted armature mechanically held in proximity to the free ends of the parallel cores and disconnected for any operative electrical functionfrom the other parts, a clapper-rod and clapper adapted to be actuated through said armature, sounding means adjacent to said clapper, and circuit connections permanently including said coil or bobbin and said condenser in series so that all current through the coil or bobbin must pass into said condenser, substantially as de scribed 2. In telephone apparatus, a combined ringer and condenser, a combined ringer and condenser comprising a frame, a yoke of mag a pair of elongated cores extending from the said yoke parallel to each other, an insulated Wire coil or bobbin upon one core, in approximately cylindrical shape, insulated conductingsheets rolled and compressed upon the other core to form a 0011- denser also approximately cylindrical in shape and of substantially the same diameter as the said bobbin, a pivoted armature mechanically held in proximity to the free ends of the parallel cores and disconnected for any operative electrical function from the other parts, a clapper-rod and clapper adapted to be actuated through said armature, sounding means adjacent to said clapper, a line-circuit, a telephone receiver and transmitter connected to'said circuit, and connections from the circuit to the combined ringer and condenser including the said coil or bobbin and the said condenser permanently in series with each other so that all current through the coil or bobbin must pass into said condenser, together with means for supplying periodic current to said circuit for signaling, and continuous current for the telephone-transmitter, substantially as describe In testimony whereof I have signed my name to this specification in the presence of tWo subscribing Witnesses.

CHARLES E. EGAN.

IVitnesses CHAS. H. WILL, H. C. WILL. 

